Yep, thats no coincidence, the likelyhood you get rarer drops is higher with higher ratings, and also your TP gauge fills quicker the higher your rating.
Don't really see what the problem is with this... it helps you know if you are on the right track with your battles, i.e. if your rating is 0/1 stars you know you need to reconsider your battle tactics!
That's fine, I guess I misunderstood (or jumped to conclusions). It sounded briefly like a scoring system only, which I find abhorrent.



